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This isn't a huge gain, but it's something, and I'm not aware of any
reason not to compress these.

Bug: 965089
Change-Id: I3931f406f7d78b8e01ed25324dfa89f675874ebb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872993
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708282}